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Review and Study Blog http://hirophysics.com/PHP/b2evolution/blog1.php en-US http://blogs.law.harvard.edu/tech/rss 60 A strange helium is created, but it really works! http://hirophysics.com/PHP/b2evolution/blog1.php/a-strange-helium-is-created Tue, 22 Nov 2016 20:58:00 +0000 Hiro physics experiment 81@http://hirophysics.com/PHP/b2evolution/
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<div><div><a href="http://hirophysics.com/PHP/b2evolution/media/blogs/review/quick-uploads/p81/antip-he-e.jpg?mtime=1479869881" rel="lightbox[p81]" id="link_93"><img alt="A strange helium is created, but it really works!" src="http://hirophysics.com/PHP/b2evolution/media/blogs/review/quick-uploads/p81/.evocache/antip-he-e.jpg/fit-320x320.jpg?mtime=1479869881" width="320" height="238" class="loadimg" /></a></div></div><p>Title:</p> <p>"Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to–electron mass ratio, <cite>Science </cite> 04 Nov 2016: Vol. 354, Issue 6312, pp. 610-614"</p> <p>Summary:</p> <p>From this experiment, one can show that the mass ratio between antiproton and electron is determined as precise as one determined by a proton-electron experiment.</p> <p>This is situated by using helium, but one electron is replaced by an antiproton. The antiproton is kept away from the proton in the nucleus because the antiproton is excited as Rydberg state.</p> <p> Cooling the atom to 1.5 and 1,7 kelvins played a crucial role for this precise experiment.</p> <p> </p> <p> </p> <p> </p><div class="item_footer"><p><small><a href="http://hirophysics.com/PHP/b2evolution/blog1.php/a-strange-helium-is-created">Original post</a> blogged on <a href="http://b2evolution.net/">b2evolution</a>.</small></p></div>
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A strange helium is created, but it really works!

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Title:

"Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to–electron mass ratio, Science  04 Nov 2016: Vol. 354, Issue 6312, pp. 610-614"

Summary:

From this experiment, one can show that the mass ratio between antiproton and electron is determined as precise as one determined by a proton-electron experiment.

This is situated by using helium, but one electron is replaced by an antiproton. The antiproton is kept away from the proton in the nucleus because the antiproton is excited as Rydberg state.

 Cooling the atom to 1.5 and 1,7 kelvins played a crucial role for this precise experiment.

 

 

 


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]]>
http://hirophysics.com/PHP/b2evolution/blog1.php/a-strange-helium-is-created#comments http://hirophysics.com/PHP/b2evolution/blog1.php?tempskin=_rss2&disp=comments&p=81
Does an airplane fly without Bernoulli’s equation? http://hirophysics.com/PHP/b2evolution/blog1.php/does-an-airplane-fly-without Mon, 18 Jan 2016 00:46:00 +0000 Hiro Education physics 61@http://hirophysics.com/PHP/b2evolution/
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<div class="image_block"><a href="/PHP/b2evolution/media/blogs/review/aerofoil.jpg?mtime=1453099497"><img class="loadimg" src="/PHP/b2evolution/media/blogs/review/aerofoil.jpg?mtime=1453099497" alt="" width="264" height="103" /></a></div> <p>Title:</p> <p>“How do wings work?”, Holger Babinsky, Physics Education Vol. 38 p 497-503, 2003</p> <p> Introduction:</p> <p>This paper clarifies how wings work for general levitation. It also shows that the typical explanation with Bernoulli’s equation is misleading. The keys are following: The curved surface of a wing and the angle of attack play a critical role for levitation. It is not necessary to use different distances of the upper and lower surfaces of an aerofoil to expound the lift.</p> <p> Summary:</p> <p>The typical explanation of how an airplane is lifted is: The upper and lower streamlines get together at the tailing edge simultaneously although the upper surface has more distance. Therefore, the upper stream is faster than lower. From Bernoulli’s equation, the faster the stream gets, the lower the pressure becomes. The lower region has higher pressure; thus, the lifting force works upward on the aerofoil. This has been believed as the right explanation; however, it turns out to be fallacy.</p> <p> In fact, the typical explanation with Bernoulli’s theorem cannot show how aircraft manage to fly upside down. From the simulation and experiment, several factors are proven:</p> <ol> <li>Even though the upper and lower surfaces have the same length, the pressure difference can be created to levitate.</li> <li>When lift is generated, the upper streamline reaches actually faster than lower one. Namely, they do NOT arrive at the tailing edge at the same time.</li> <li>A curved surface, however, creates pressure gradients (differences) in terms of stream lines for the lift.</li> <li>The thickness of aerofoil does not influence the flow pattern of streamlines, but some specific shape, such as bird’s wings, could create more effective pressure gradients for the levitation.</li> </ol> <p> In conclusion, the correct explanation is given as follows: A curved aerofoil creates pressure gradients along with the streamlines. In addition, changing the angle of attack alters the pressure gradients around the aerofoil to control the lift points, up or down. (It could make a stalled flow.)</p> <p> </p><div class="item_footer"><p><small><a href="http://hirophysics.com/PHP/b2evolution/blog1.php/does-an-airplane-fly-without">Original post</a> blogged on <a href="http://b2evolution.net/">b2evolution</a>.</small></p></div>
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